Performance analysis for priority based broadcast in vehicular networks

Transportation safety is one of the most important applications for vehicular ad-hoc networks based on IEEE 802.11p. When a vehicle is in an emergency condition, a safety-related message is transmitted to the neighboring vehicles and infrastructures. Vehicles and infrastructures are exchanging periodic messages on the vehicle position, traffic information to provide various services. When the traffic load is very high, the emergency message cannot be delivered immediately. To overcome this situation, a priority based transmission scheme is considered to guarantee the transmission of the emergency message. We analyze the performance of vehicular communication networks in two perspectives. Firstly, an analytical Markov-chain model for vehicle-to-vehicle (V2V) ad-hoc communication networks is proposed for broadcasting messages with priority based on IEEE 802.11p. Secondly, an analytic Queuing model for vehicular communication networks are proposed to evaluate the network performance for dealing with safety and non-safety messages from the point of the infrastructure.